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#ifndef PCL_GEOMETRY_GET_BOUNDARY_H
#define PCL_GEOMETRY_GET_BOUNDARY_H

#include <vector>

namespace pcl_godel
{
namespace geometry
{
/** \brief Get a collection of boundary half-edges for the input mesh.
  * \param[in] mesh The input mesh.
  * \param[out] boundary_he_collection Collection of boundary half-edges. Each element in the vector
 * is one connected boundary. The whole boundary is the union of all elements.
  * \param [in] expected_size If you already know the size of the longest boundary you can tell this
 * here. Defaults to 3 (minimum possible boundary).
  * \author Martin Saelzle
  * \ingroup geometry
  */
template <class MeshT>
void getBoundBoundaryHalfEdges(const MeshT& mesh,
                               std::vector<typename MeshT::HalfEdgeIndices>& boundary_he_collection,
                               const size_t expected_size = 3)
{
  typedef MeshT Mesh;
  typedef typename Mesh::HalfEdgeIndex HalfEdgeIndex;
  typedef typename Mesh::HalfEdgeIndices HalfEdgeIndices;
  typedef typename Mesh::InnerHalfEdgeAroundFaceCirculator IHEAFC;

  boundary_he_collection.clear();

  HalfEdgeIndices boundary_he;
  boundary_he.reserve(expected_size);
  std::vector<bool> visited(mesh.sizeEdges(), false);
  IHEAFC circ, circ_end;

  for (HalfEdgeIndex i(0); i < HalfEdgeIndex(mesh.sizeHalfEdges()); ++i)
  {
    if (mesh.isBoundary(i) && !visited[pcl::geometry::toEdgeIndex(i).get()])
    {
      boundary_he.clear();

      circ = mesh.getInnerHalfEdgeAroundFaceCirculator(i);
      circ_end = circ;
      do
      {
        visited[pcl::geometry::toEdgeIndex(circ.getTargetIndex()).get()] = true;
        boundary_he.push_back(circ.getTargetIndex());
      } while (++circ != circ_end);

      boundary_he_collection.push_back(boundary_he);
    }
  }
}

} // End namespace geometry
} // End namespace pcl_godel

#endif // PCL_GEOMETRY_GET_BOUNDARY_H
